AnswersSnider - Biology Living Earth B Summer 2026Unit Test

Unit Test — Unit test Answers

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Which factors are causes of short-term climate change?

A
changes in wind and ocean currents
B
an increase of thunderstorms and rain
C
changes in daily wind shifts and snowfall
D
an increase of hurricanes and volcanic eruptions
2
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Rainforests around the world are being cleared at an alarming rate to make room for new communities, agriculture, mining, and roads, and to provide lumber for construction and furniture. How might the destruction of rainforests affect the balance of gases in Earth's atmosphere?

A
by increasing carbon dioxide and decreasing oxygen
B
by increasing carbon dioxide and increasing oxygen
C
by decreasing carbon dioxide and increasing oxygen
D
by decreasing carbon dioxideand decreasing oxygen
3

Which correctly lists three greenhouse gases?

A
oxygen, carbon dioxide, helium
B
carbon dioxide, nitrous oxide, methane
C
helium, methane, oxygen
D
methane, oxygen, carbon dioxide
4

How do scientists use ice to study ancient climates?

A
through glacial deposits and ice cores
B
through glacial deposits and ice ages
C
through ice cores and Earth’s ellipse
D
through Earth’s ellipse and ice ages
5

Which human activity is correctly paired with the greenhouse gas that it increases?

A
rice cultivation and water vapor
B
landfilling and carbon dioxide
C
deforestation and methane
D
sewage treatment and nitrous oxide
6

What statement is accurate based on the study of tree rings?

A
Trees near the arctic will have thicker rings than those near the equator.
B
Trees with a pattern of thin rings indicate a wet, warm climate.
C
Size and density of tree rings can give information on past climates.
D
The number of rings indicate how much fruit the tree can bear.
7

Which environmental policy must consider the expensive startup costs associated with building machines that harvest energy from clean sources?

A
reducing air pollution
B
regulating deforestation
C
introducing new farming methods
D
protecting ocean reefs
8

How does the construction of dams positively affect natural resources?

A
by providing water for irrigation and restoring trees to areas where forests once existed
B
by creating reservoirs, preventing flooding, and renewing destroyed ecosystems
C
by preventing flooding, creating reservoirs, and providing water for irrigation
D
by renewing destroyed ecosystems and restoring trees to areas where forest once existed
9

Which best explains the effect of reforestation on land?

A
It allows crops to grow in wide steps along slopes.
B
It turns land slowly into desert.
C
It turns habitable land uninhabitable.
D
It restores trees to areas where they once grew.
10

Which sustainable practice is paired correctly with its impact on the environment?

A
Using bamboo results in an increased use of forest trees.
B
Practicing contour plowing results in a need for more land.
C
Setting irrigation systems to run longer results in a reduction of water use.
D
Building more wind farms results in a reduction of fossil fuel use.
11

Which statement explains how smog forms?

A
Volcanoes erupt and release ash into the sky.
B
Strong storms pick up soil and mix it with fog.
C
Sunlight and heat react with gases in the atmosphere.
D
Gases move high into the atmosphere and then fall to Earth in rain.
12

Which substance may lower air temperatures after a volcanic eruption?

A
lava
B
sulfur dioxide
C
carbon dioxide
D
water vapor
13

What happens when volcanoes release greenhouse gases into the atmosphere?

A
The climate gets warmer.
B
The climate gets cooler.
C
Winter becomes longer.
D
Summer becomes longer.
14

Why is urbanization contributing to pollution?

A
People in urban areas strip the soil of nutrients and make it difficult to grow crops.
B
People in urban areas consume more energy, food, and water.
C
People in urban areas remove minerals and metals from the ground, which increases erosion.
D
People in urban areas log forests and mine, which causes climate change.
15

How does La Niña affect the climate of the Pacific Ocean?

A
The ocean becomes cooler.
B
The warm water moves toward the east.
C
The cold water sinks deeper into the ocean.
D
The strength of the prevailing winds decreases.
16

Which substance is a greenhouse gas that is emitted by human activities, is the most widespread, and remains in the air the longest?

A
water vapor
B
methane
C
fluorinated gas
D
carbon dioxide
17

A factory is emitting large amounts of CFCs into the atmosphere. How might this affect people?

A
increase in the rate of malaria breakouts
B
increase in the level of ocean water
C
increase in the rate of skin cancer
D
increase in the frequency of violent storms
18

What moves toward the east during El Niño?

A
warm water
B
cold water
C
slow currents
D
fast currents
19

Which statement explains why many scientists believe that carbon dioxide has likely contributed more to global warming than other greenhouse gases?

A
Carbon dioxide is emitted from fertilizers used in farming.
B
Other greenhouse gases trap more heat than carbon dioxide.
C
Carbon dioxide has increased as a result of increased human activities.
D
Carbon dioxide is emitted from commercial refrigeration.
20

What should scientists consider when studying tree rings to understand the variations in the local climate?

A
patterns in their width, their density, and their composition
B
odor from the wood, patterns in their width, and their density
C
their composition, odor from the wood, and patterns in their width
D
their density, composition, and location

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